Malicious PDF — malware analysis report

Static analysis result for SHA-256 602d815703f1f7e1…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 06:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3796a89ff19d24c189f75feaae7e4593 SHA-1: e002e406aa20a223f513fc2ccbcac97e555f5117 SHA-256: 602d815703f1f7e153e31adf2782f9376063d95663ec9b0c5f97084d1eb07d99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=new+manual+cars+for+sale+nz PDF link annotation
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sldf6msn169r3vq223f9u9q410/gilatedije.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/fironesijojetibitu.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/xemunifurefegudefis.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607cd3032d2a1---bunovomidujifo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/de79e9696404aaeab478d5da21201768/83413047916.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/70ba7732d3943e0814093375f9b12150/fototavatasoduxexusofe.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/sojiwufavu.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/24437425548.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/241542om054o304mbml3m81vn0/86205659350.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d4e3882e12c93170e499192e53f2744e/lapakoli.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088e40a27108---suralinubajisip.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/mineme.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ec3e83fd9a2c04451d798bbf28d2cfc6/55705136480.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee89904d38e---86993863395.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/5n5ai2kmk85r178u3t2p9s2cps/figabowifujunewokilo.pdfIn PDF document text
    • https://auto826.com/uploads/files/10209341876.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d9dfbb7e454e1706cb07819cd51f92fe/sotekunevoneduriwege.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/69762156160.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b084b35f132---vuzede.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/78050972874.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/42808232783.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39493830013.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 18024 bytes
SHA-256: 41d02388a835612b69f6be206e10ae5b0f18fba9a43c901565347be4e7316314
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 10532 bytes
SHA-256: 2f5064e844e1a1406eb1ca5a8ea58ade11c2e8283ef774275597a931520f5a45
font_02_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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